@import url(https://www.enagic.co.jp/mt/mt-static/themes-base/blog.css);
@import url(https://www.enagic.co.jp/mt/mt-static/themes/minimalist-red/styles.css);
<style type="text/css">
div.blocka {
   float: left;
   width: 50%;
}
div.blockb {
   float: left;
   width: 50%;
}
div.blockc {
   clear: both;
}
</style>